`verb; meaning to get so obsessively jealous in a relationship, one would go to extraordinary methods to hurt a potential competitor.
Used on some late night TV after the February 2007 incident where a lovesick astronaut, Lisa Nowak, drove 900 miles in diapers to confront and threaten a rival for the affections of her boy friend
Not as fatal as going postal, in most cases...
Actually it seems everybody on the OC is ready to go astronaut at the same time.
My first wife went astronaut on my girlfriend when she found out I took her to Branson for her birthday. Fortunately the cops were there